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San Joaquin County Community Environmental Setting, Impacts,and Mitigation Measures <br /> Development Department Geology,Soils,and Seismicity <br /> ■ expose people or structures to seismically related ground failure,including — <br /> liquefaction; <br /> ■ expose people or structures to landslides; — <br /> ■ result in substantial soil erosion or the loss of topsoil; <br /> ■ be located on a geologic unit or soil that is unstable or that would become — <br /> unstable as a result of the project and potentially result in an on-site or off- <br /> site landslide, lateral spreading, subsidence, liquefaction, or collapse;or <br /> ■ be located on expansive soil, as defined in Table 18-1-B of the UBC <br /> (International Code Council 1997),creating substantial risks to life or <br /> property. <br /> Impacts and Mitigation Measures <br /> Impact GEO-1 : Potential Structural Damage and Injury <br /> from Fault Rupture (Less than Significant) <br /> The project area is not located in an Alquist-Priolo Special Studies Zone,but <br /> implementing the project would cause development in UBC Seismic Hazard <br /> Zone 3,where earthquake severity and probable structural damage from nearby <br /> earthquakes would be moderate. This impact is not considered significant <br /> because all stnrctures would conform to the latest CBSC standards,which <br /> establish requirements for seismic safety of all structures, and because the — <br /> proposed mining activities present no change in existing conditions with respect <br /> to the present surface rupture or faulting hazards. This impact is considered <br /> less than significant.No mitigation is required. — <br /> Impact GEO-2: Potential Structural Damage and Injury <br /> from Ground Shaking (Dry Pit Operation) (Less than <br /> Significant) <br /> A large earthquake could potentially cause moderate to strong ground shaking in <br /> the project area. However, it is assumed that all materials processing plants and <br /> other structures would conform to the CBSC standards, which establish — <br /> requirements for seismic safety of all structures. Furthermore, subsurface <br /> conditions after the proposed mining activities would be similar to existing <br /> conditions with respect to response to groundshaking. This impact is <br /> considered less than significant,No mitigation is required. <br /> DeSilva Gates Quarry Project — <br /> Draft Environmental Impact Report 3.F-12 <br /> JSs 05105.05 <br />